{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["DNA", "cell type", "cell line", "protein", "RNA"], "input": "Estrogen receptor positive ( ER+: MCF-7 ) and negative ( ER-: MDA-MB-231 ) human breast cancer cell lines were utilized to evaluate the effects of tamoxifen ( TAM ) and estradiol ( E2 ) on modulation of breast cancer target susceptibility to lysis by lymphokine-activated killer (LAK) cells ."}
{"DNA": [], "cell type": ["lymphokine-activated killer (LAK) cells"], "cell line": ["Estrogen receptor positive ( ER+: MCF-7 ) and negative ( ER-: MDA-MB-231 ) human breast cancer cell lines", "ER+: MCF-7", "ER-: MDA-MB-231", "human breast cancer cell lines"], "protein": [], "RNA": []}